__initfunc(static enum uart check_uart(unsigned int iobase))
{
unsigned char b1,b2,b3;
enum uart u;
enum uart uart_tab[] = { c_uart_16450, c_uart_unknown, c_uart_16550, c_uart_16550A };
if (iobase <= 0 || iobase > 0x1000-SER_EXTENT)
return c_uart_unknown;
if (check_region(iobase, SER_EXTENT))
return c_uart_unknown;
b1 = inb(UART_MCR(iobase));
outb(b1 | 0x10, UART_MCR(iobase)); /* loopback mode */
b2 = inb(UART_MSR(iobase));
outb(0x1a, UART_MCR(iobase));
b3 = inb(UART_MSR(iobase)) & 0xf0;
outb(b1, UART_MCR(iobase)); /* restore old values */
outb(b2, UART_MSR(iobase));
if (b3 != 0x90)
return c_uart_unknown;
inb(UART_RBR(iobase));
inb(UART_RBR(iobase));
outb(0x01, UART_FCR(iobase)); /* enable FIFOs */
u = uart_tab[(inb(UART_IIR(iobase)) >> 6) & 3];
if (u == c_uart_16450) {
outb(0x5a, UART_SCR(iobase));
b1 = inb(UART_SCR(iobase));
outb(0xa5, UART_SCR(iobase));
b2 = inb(UART_SCR(iobase));
if ((b1 != 0x5a) || (b2 != 0xa5))
u = c_uart_8250;
}
return u;
}
/*
* This is the serial driver's generic interrupt routine
* Note: Generally it should be attached to general interrupt 10, responsile
* for UART0&1 RCV and XMT interrupt, to make sure the invoked interrupt
* source, look into bit 10-13 of SIC_ISR(peripheral interrupt status reg.
* Finally, to see what can be done about request_irq(......)
*/
void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
struct bf535_serial *info; // = &bf535_soft[CONFIG_SERIAL_CONSOLE_PORT];
unsigned short iir; /* Interrupt Identification Register */
unsigned short rx, idx;
unsigned int sic_status = SIC_ISR;
for (idx = 0; idx < NR_PORTS; idx++){
if (sic_status & (UART_INVOKED << 2*(idx + 5))){
/* test bit 10-11 and 12-13 */
iir = UART_IIR(idx);
info = &bf535_soft[idx];
if (!(iir & UART_IIR_NOINT)){
switch (iir & UART_IIR_STATUS){
case UART_IIR_LSR:
printk("Line status changed for serial port %d.\n", idx);
break;
case UART_IIR_RBR:
/* Change access to IER & data port */
ACCESS_PORT_IER(idx)
if (UART_LSR(idx) & UART_LSR_DR){
rx = UART_RBR(idx);
receive_chars(info, regs, rx);
}
break;
case UART_IIR_THR:
/* Change access to IER & data port */
ACCESS_PORT_IER(idx)
if (UART_LSR(idx) & UART_LSR_THRE){
transmit_chars(info);
// do{
// transmit_chars(info);
// }while(info->xmit_cnt > 0);
}
break;
case UART_IIR_MSR:
printk("Modem status changed for serial port.\n");
}
}
}
}
